I would like to know if there is an easy combination to change comments, for example like cic or delete the comments like
dac. Note that this does not work (for as far as I could find) with the vim-commentary or NERD commenter plugins.

@PeterRincker: I've never used Commentary.vim but from reading the readme I'm not sure gc is the same thing: is it possible for example to do something like vgc to visually select the content of a comment?
– statox♦Apr 5 '16 at 14:33

Commentary.vim does not provide a visual mode mapping for gc. It only provides an operator pending mode mapping. I pretty much only use if for toggling a comment block via: gcgc
– Peter RinckerApr 5 '16 at 14:36

1

That sounds pretty useful. Actually I created this answer because I suggested vim-textobj-comment in the comments of the question and OP said it was what he wanted but maybe you should also add an answer with commentary.vim if it fills the needs of the question.
– statox♦Apr 5 '16 at 14:39